BLOCK DIAGRAM:
APPLICATION CIRCUIT:
This is recommended to suppress power supply disturbances. The output voltage should not be hold continuously at a voltage below 3.3V by the external circuit.
SUITABLE DATA FORMAT:
The circuit of the TSOP1738 is designed in that way that unexpected output pulses due to noise or disturbance signals are avoided. A band pass filter, an integrator stage and an automatic gain control are used to suppress such disturbances. The distinguishing mark between data signal and disturbance signal are carrier frequency, burst length and duty cycle. The data signal should full fill the following condition:
Ø Carrier frequency should be close to center frequency of the band pass (e.g. 38 kHz).
Ø Burst length should be 10cycles/burst or longer.
Ø After each burst which is between 10 cycles and 70 cycles a gap time of at least 14 cycles is necessary.
Ø For each burst which is longer than 1.8ms a corresponding gap time is necessary at some time in the data stream. This gap time should have at least same length as the burst.
Ø DC light (e.g. from tungsten bulb or sunlight)
Ø Continuous signal at 38 kHz or at any other frequency
Ø Signals from fluorescent lamps with electronic ballast

DESCRIPTION:
The Device is a monolithic integrated high voltage, high current four channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads (such as relays solenoids, DC and stepping motors) and switching power transistors. To simplify use as two bridges each pair of channels is equipped with an enable input. A separate supply input is provided for the logic, allowing operation at a lower voltage and internal clamp diodes are included. This device is suitable for use in switching applications at frequencies up to 5 kHz. The L293D is assembled in a 16 lead plastic package which has 4 center pins connected together and used for heat sinking.
BLOCK DIAGRAM:

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This is the one stop educational site for all Electronic and Computer students. If you want to learn something new then we are here to help. We work on Microcontroller projects, Basic Electronics, Digital electronics, Computer projects and also in basic c/c++ programs.